Dear student!
Think of the features that a flower will show which needs to be pollinated by wind. Firstly, it will be colourless and non- fragrant. Secondly, it will have no nectar to offer to insects in return of pollination. Thirdly the stigma and the style will be feathery to catch the pollen grains from the air. They will also be conspicuous and the pollens will be produced in large numbers.
Hope this helps.
Good luck!